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Metric Sex Determination of the Human Coxal Bone on a Virtual Sample using Decision Trees |
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| Authors: | Frédéric Savall MD Marie Faruch-Bilfeld MD Fabrice Dedouit MD PhD Nicolas Sans MD PhD Hervé Rousseau MD PhD Daniel Rougé MD PhD Norbert Telmon MD PhD |
| Institution: | 1. Laboratoire d'Anthropobiologie AMIS, UMR 5288 CNRS, Université Paul Sabatier, 37 allées Jules Guesde, 31000 Toulouse, France
Service de Médecine Légale, Centre Hospitalier Universitaire Rangueil, avenue du Professeur Jean Poulhès, 31059 Toulouse Cedex 9, France Additional information and reprint requests: Frédéric Savall, M.D. Service de Médecine Légale Hôpital de Rangueil 1 Avenue du Professeur Jean Poulhès TSA 50032 31059 Toulouse Cedex 9 France E-mail: fredsavall@hotmail.fr;2. Laboratoire d'Anthropobiologie AMIS, UMR 5288 CNRS, Université Paul Sabatier, 37 allées Jules Guesde, 31000 Toulouse, France Service de Radiologie, Centre Hospitalier Universitaire Purpan, place du docteur Baylac, 31059 Toulouse, France;3. Laboratoire d'Anthropobiologie AMIS, UMR 5288 CNRS, Université Paul Sabatier, 37 allées Jules Guesde, 31000 Toulouse, France Service de Médecine Légale, Centre Hospitalier Universitaire Rangueil, avenue du Professeur Jean Poulhès, 31059 Toulouse Cedex 9, France Service de Radiologie, Centre Hospitalier Universitaire Rangueil, avenue du Professeur Jean Poulhès, 31059 Toulouse Cedex 9, France;4. Service de Radiologie, Centre Hospitalier Universitaire Purpan, place du docteur Baylac, 31059 Toulouse, France;5. Service de Radiologie, Centre Hospitalier Universitaire Rangueil, avenue du Professeur Jean Poulhès, 31059 Toulouse Cedex 9, France;6. Laboratoire d'Anthropobiologie AMIS, UMR 5288 CNRS, Université Paul Sabatier, 37 allées Jules Guesde, 31000 Toulouse, France Service de Médecine Légale, Centre Hospitalier Universitaire Rangueil, avenue du Professeur Jean Poulhès, 31059 Toulouse Cedex 9, France |
| Abstract: | Decision trees provide an alternative to multivariate discriminant analysis, which is still the most commonly used in anthropometric studies. Our study analyzed the metric characterization of a recent virtual sample of 113 coxal bones using decision trees for sex determination. From 17 osteometric type I landmarks, a dataset was built with five classic distances traditionally reported in the literature and six new distances selected using the two-step ratio method. A ten-fold cross-validation was performed, and a decision tree was established on two subsamples (training and test sets). The decision tree established on the training set included three nodes and its application to the test set correctly classified 92% of individuals. This percentage was similar to the data of the literature. The usefulness of decision trees has been demonstrated in numerous fields. They have been already used in sex determination, body mass prediction, and ancestry estimation. This study shows another use of decision trees enabling simple and accurate sex determination. |
| Keywords: | forensic science forensic anthropology decision trees sexual dimorphism coxal bone multislice computed tomography |